Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c35388c52a97ae0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 20:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1f9617f935ad14029d88d9d4a4749301 SHA-1: db1f3115d353710750d81bdf193a551eb0b1e78d SHA-256: 3c35388c52a97ae0dee77d0ea5e12166209b655b800f996b70a815f2482178d8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it is designed to trick users into downloading malicious content. The presence of a visual download button further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=after+effects+download+free+apk PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee00fe2388---20452901963.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98c6044b3---sateten.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/toledipedewuvura.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4a2f6abe4f03e39f4b646f536c85656e/94687168815.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/buzivo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc82ca7e2---paratekeki.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/xepeg.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/losugatutenopokejuleju.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/wojegoxesan.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/pojisewivadufimirikaz.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/11493604026.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3eb014c5---12121203918.pdfIn PDF document text
    • http://shopabrang.com/images/files/77741568248.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/422697868.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/36870089847.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/narigikasejetodavodamimu.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/megobuwelax.pdfIn PDF document text
    • https://anfauglir.com/images/file/ganagamoga.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/bigawemegopupaxe.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabipal.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/96570170880.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/wevutugopemodu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/65c51ad4b450536bf1c8e4926c3a9367/figafugosod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 18736 bytes
SHA-256: 3070a8074011434df1ff6270714071dbcb4241ccfd7ba66ffa1a730ba45f2d19
font_01_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 10680 bytes
SHA-256: 45a35ad8790d879d91cd7628857c438571b9963138ff84c64454e350c949c882

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